diff --git a/crystal.cpp b/crystal.cpp
index 555719f3..224d8fac 100644
--- a/crystal.cpp
+++ b/crystal.cpp
@@ -1014,7 +1014,7 @@ EX void set_land(cell *c) {
   set_euland3(c, co1[0], co1[1], dist_alt(c), hash);
   }
 
-void set_crystal(int sides) {
+EX void set_crystal(int sides) {
   stop_game();
   set_geometry(gCrystal);
   set_variation(eVariation::pure);
diff --git a/game.cpp b/game.cpp
index 332f0b19..f0bd93e3 100644
--- a/game.cpp
+++ b/game.cpp
@@ -8748,7 +8748,7 @@ EX bool mightBeMine(cell *c) {
   return c->wall == waMineUnknown || c->wall == waMineMine;
   }
 
-hookset<bool(cell*)> *hooks_mark;
+EX hookset<bool(cell*)> *hooks_mark;
 
 EX void performMarkCommand(cell *c) {
   if(!c) return;
diff --git a/hyperpoint.cpp b/hyperpoint.cpp
index 9d87f87f..90369ef8 100644
--- a/hyperpoint.cpp
+++ b/hyperpoint.cpp
@@ -395,7 +395,7 @@ EX hyperpoint normalize(hyperpoint H) {
   }
 
 /** get the center of the line segment from H1 to H2 */
-hyperpoint mid(const hyperpoint& H1, const hyperpoint& H2) {
+EX hyperpoint mid(const hyperpoint& H1, const hyperpoint& H2) {
   if(prod) {
     auto d1 = product_decompose(H1);
     auto d2 = product_decompose(H2);